巢北地區(qū)下石炭統(tǒng)沉積環(huán)境與古生態(tài)恢復
發(fā)布時間：2019-06-06 19:07
【摘要】：安徽巢湖北部地區(qū)位于下?lián)P子板塊北部邊緣部分,下石炭統(tǒng)發(fā)育良好,分布廣泛,沉積特征明顯。通過對巢北地區(qū)詳細的野外測量和系統(tǒng)的巖石學、沉積學、古生態(tài)學的研究,尤其是進行碳酸鹽巖石微相研究,分析下石炭統(tǒng)是沉積環(huán)境特征演化及古生態(tài)環(huán)境。首先對研究區(qū)內下石炭統(tǒng)的野外地層典型剖面進行系統(tǒng)的剖面測量,描述宏觀巖石特征及沉積標志,系統(tǒng)地采集樣品,在室內對巖石薄片中的顯微特征進行觀察,尤其是生物碎屑的類型、生屑組合特征等進行了詳細的鑒定與描述,在此基礎上劃分出九種巖石微相。巢湖北部下石炭沉積相模式主要有:開闊臺地相模式,對應于金陵組、和州組下部的灰?guī)r部分;潮坪-瀉湖-砂壩相模式,對應于高驪山組;淡化極淺水潮坪瀉湖相模式,對應于和州組第四旋回、第五旋回頂部;生物碎屑淺灘相模式,對應于和州組第五、六旋回的塊狀灰?guī)r。通過對地層中的宏體化石、微體化石與生屑組合、遺跡化石的研究,總結了金陵組、高驪山組、和州組的古生態(tài)特征,和州組劃分出了六種古生態(tài)環(huán)境。
[Abstract]:The northern Chaohu area of Anhui Province is located in the northern margin of the Lower Yangtze plate. The Lower Carboniferous is well developed and widely distributed, and the sedimentary characteristics are obvious. Based on the detailed field survey and systematic petrology, sedimentology and paleoecology in Chaobei area, especially the study of carbonate rock microfacies, the evolution of sedimentary environment and paleoecological environment of Lower Carboniferous are analyzed. First of all, the typical profile of the Lower Carboniferous field strata in the study area is systematically measured, the macroscopic rock characteristics and sedimentary marks are described, the samples are systematically collected, and the microscopic characteristics of the rock sheets are observed in the laboratory. In particular, the types of bioclastic and the characteristics of bioclastic assemblages are identified and described in detail, on the basis of which nine kinds of rock microfacies are divided. The lower carbon sedimentary facies models in the north of Chaohu Lake are as follows: open platform facies model, corresponding to Jinling formation, limestone part in the lower part of Hezhou formation, Chaoping-lagoon-sand bar phase model, corresponding to Gaolishan formation; The desalination model corresponds to the fourth cycle and the top of the fifth cycle of the Hezhou formation, and the bioclastic shoal pattern corresponds to the massive limestone of the fifth and sixth cycles of the Hezhou formation. Based on the study of macrofossils, microfossils, bioclastic assemblages and trace fossils in strata, the paleoecological characteristics of Jinling formation, Gaolishan formation and Hezhou formation are summarized, and six kinds of paleoecological environments are divided into Hezhou formation.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P512.2;P534.45
[Abstract]:The northern Chaohu area of Anhui Province is located in the northern margin of the Lower Yangtze plate. The Lower Carboniferous is well developed and widely distributed, and the sedimentary characteristics are obvious. Based on the detailed field survey and systematic petrology, sedimentology and paleoecology in Chaobei area, especially the study of carbonate rock microfacies, the evolution of sedimentary environment and paleoecological environment of Lower Carboniferous are analyzed. First of all, the typical profile of the Lower Carboniferous field strata in the study area is systematically measured, the macroscopic rock characteristics and sedimentary marks are described, the samples are systematically collected, and the microscopic characteristics of the rock sheets are observed in the laboratory. In particular, the types of bioclastic and the characteristics of bioclastic assemblages are identified and described in detail, on the basis of which nine kinds of rock microfacies are divided. The lower carbon sedimentary facies models in the north of Chaohu Lake are as follows: open platform facies model, corresponding to Jinling formation, limestone part in the lower part of Hezhou formation, Chaoping-lagoon-sand bar phase model, corresponding to Gaolishan formation; The desalination model corresponds to the fourth cycle and the top of the fifth cycle of the Hezhou formation, and the bioclastic shoal pattern corresponds to the massive limestone of the fifth and sixth cycles of the Hezhou formation. Based on the study of macrofossils, microfossils, bioclastic assemblages and trace fossils in strata, the paleoecological characteristics of Jinling formation, Gaolishan formation and Hezhou formation are summarized, and six kinds of paleoecological environments are divided into Hezhou formation.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P512.2;P534.45
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